CVE-2025-55948: X-springboot Auth Bypass Vulnerability

CVE-2025-55948 Overview

CVE-2025-55948 is a critical authorization bypass vulnerability in yzcheng90 X-SpringBoot 6.0 that arises from improper implementation of role-based access control (RBAC). The application relies on dual dependency between frontend menu systems and backend permission tables without enforcing atomic synchronization between these components. When frontend menu updates (such as privilege revocation) fail to propagate to the backend permission table in real-time, a dangerous desynchronization occurs. While users lose access to restricted functions through the web interface as UI elements properly disappear, stale permission records still validate unauthorized API requests when accessed directly through tools like Postman or curl.

Critical Impact

Attackers exploiting this RBAC desynchronization can bypass authorization controls to create high-permission user accounts, access sensitive data beyond their clearance level, and execute admin-level commands through direct API access.

Affected Products

• yzcheng90 X-SpringBoot 6.0

Discovery Timeline

• 2025-12-04 - CVE-2025-55948 published to NVD
• 2025-12-23 - Last updated in NVD database

Technical Details for CVE-2025-55948

Vulnerability Analysis

This authorization bypass vulnerability stems from a fundamental architectural flaw in how X-SpringBoot 6.0 manages access control state across its application layers. The RBAC implementation maintains permissions in two separate locations: the frontend menu configuration that controls UI element visibility, and a backend permission table that validates API requests. These two systems operate independently without a synchronization mechanism to ensure consistency.

When an administrator revokes a user's privileges through the administrative interface, the system updates the frontend menu configuration to hide restricted UI elements. However, the corresponding permission entries in the backend table remain unchanged until a separate update process occurs. During this window of inconsistency, the user appears to have lost access from the UI perspective but retains full API-level authorization.

This design flaw allows attackers with knowledge of the API endpoints to circumvent access controls entirely by making direct HTTP requests. The backend authorization layer continues to honor the stale permission records, effectively treating revoked users as still authorized. This is particularly dangerous in enterprise environments where privilege changes may occur frequently due to role transitions, terminations, or security incidents.

Root Cause

The root cause is improper privilege management (CWE-266) arising from the lack of atomic synchronization between the frontend access control layer and backend permission validation. The system fails to implement transactional consistency when updating user permissions, allowing a race condition where UI-based access revocation does not immediately reflect in API authorization checks. This architectural oversight creates a persistent authorization gap that attackers can exploit.

Attack Vector

The attack exploits network-accessible API endpoints that remain authorized even after frontend privilege revocation. An attacker who previously held legitimate access to the system (or has knowledge of a recently-demoted user's credentials) can:

1. Identify that their UI access to certain functions has been revoked
2. Use API documentation or network traffic analysis to determine endpoint URLs
3. Craft direct HTTP requests to privileged endpoints using tools like Postman, curl, or custom scripts
4. Execute administrative operations including user creation, data access, and system configuration changes

The vulnerability requires no user interaction and can be exploited remotely over the network. Since the backend permissions remain valid, all API requests appear legitimate from the server's perspective, making detection through standard logging challenging.

Detection Methods for CVE-2025-55948

Indicators of Compromise

• API requests to administrative endpoints from users whose UI-level permissions have been recently revoked
• Unusual patterns of direct API calls bypassing the standard web interface workflow
• User accounts accessing sensitive data or performing privileged operations after role changes
• Creation of new administrative accounts by users with recently demoted privileges

Detection Strategies

• Implement comprehensive API access logging that correlates requests with current permission states rather than cached values
• Deploy real-time monitoring for administrative API endpoints with alerting on suspicious access patterns
• Cross-reference API audit logs with permission change events to identify post-revocation access attempts
• Monitor for direct API tool signatures (non-browser User-Agents) accessing privileged endpoints

Monitoring Recommendations

• Enable detailed request logging for all administrative and privilege-sensitive API endpoints
• Implement anomaly detection for users whose access patterns deviate from their expected permission level
• Create alerts for administrative actions performed via direct API calls rather than the web interface
• Regularly audit permission synchronization between frontend configuration and backend tables

How to Mitigate CVE-2025-55948

Immediate Actions Required

• Audit all recent permission changes and verify backend table synchronization with frontend configurations
• Implement API-level access controls that validate permissions directly from the authoritative source on each request
• Consider implementing session invalidation upon any permission changes to force re-authentication
• Review logs for any suspicious API access patterns that may indicate ongoing exploitation

Patch Information

No official vendor patch has been released at this time. Organizations using X-SpringBoot 6.0 should implement the workarounds described below and monitor the GitHub X-SpringBoot Project for security updates. Additional technical details about this vulnerability are available in the GitHub Vulnerability Database Entry.

Workarounds

• Implement real-time permission validation at the API layer that queries the authoritative permission source for each request rather than relying on cached values
• Add middleware that forces session termination and token invalidation whenever user permissions are modified
• Deploy a web application firewall (WAF) with rules to detect and block direct API access to administrative endpoints from non-administrative users
• Consider implementing a permission change event bus that synchronously updates all authorization checkpoints when privileges are modified